HDR problem web saving

I was trying this out and from 4 shots, got a 111meg file.  I wanted to use on a website and made a jpeg, and it was only 177kb, when I wanted more like >500kb.  I tried different different image sizes and saving qualities but it always came out 177kb.  I read that it could be limited unless saved for web, but I don't see any Save for Web in CC.